Sterling Power Products DAI-1500C-12xx, DAI-3000C-24xx Transfer system, Solar charge regulator

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G.2 The Transfer system

When an AC voltage is present at the AC IN of the unit , the “AC IN” LED is lit. When this voltage matches the Parameter P-06 value set, and the frequency is between 44Hz and 65Hz, then this power is transferred directly to the AC load and the battery charger section . The “TRANSFER” LED is lit to indicate

this has happened. The inverter is then switched off and the battery charger switched on. This process is automatic and should not be noticed by the load, at worst a slight flicker may be seen in lights.

The maximum current of the Bypass switch is 60A (CUxx3500) resp.

30A (CUxx1700). That means through this system AC loads of up to a maximum of 7000 W (CUxx3500) or 3500W (CUxx1700) can be operated. When the Battery Charger is working, part of this power is used for the charging according to the power sharing settings.

The Transfer system is protected against overload with an automatic breaker on the AC Input side of the unit . If the system has been overloaded

the Input breaker will pop-out. To put the automatic safety system back in to operating you must push this breaker for reset.

Note: In inverter operation the unit generates a pure sinewave and quartz stabilized output voltage. However, when the unit is transferring power from the grid or a generator the voltage and quality of the power running the AC load will be the same as that coming from the grid or generator. The unit cannot modify the incoming AC supply.

G.3 The solar charge regulator

The unit has a built-in solar charge regulator. To charge the batteries solar modules can be connected to the terminal SOLAR IN +/-. The

built-in regulator is a shunt regulator with a maximum input current of 30A for all series products. The operating voltage of solar modules to be connected must match the actual operating voltage of the unit and never exceed the max. rated value.

Under no circumstances should any other charging sources such as a wind-generator be connected at the input of the solar charge regulator.

The Solar Charge Regulator works automatically and is always in operation. As soon as the energy is delivered from the solar charge regulator, the “SOLAR CHARGE” LED is lit and the batteries are being charged, The solar charge regulator works even when the battery charger is functioning. The method of operation is a 3 or 4 step charging process, the same as the battery charger. The function is described in the section on battery charger. The programming and the adjustments are carried out in accordance with the section on battery charger. The programming and the adjustments are carried out in accordance with the same conditions. Check with your battery supplier which adjustments must be carried out for your battery.